The only byte-oriented arithmeticfunction on the SPU is absdb, "absolute difference of bytes," which gives the absolute value of the difference between two operands.
SPU 上惟一一个面向字节的计算函数是 absdb（意思是 “absolute difference of bytes”），计算两个操作数间的差的绝对值。
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You should make each different arithmeticfunction its own action/method/whatevertheframeworkcallsit and you should use the frameworks input validation for the form values (if it has one).
Gdb indicates that the program gets an arithmetic exception at line 7 and usefully prints out the line and the values of the arguments to the wib function.